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[Chemical Knowledge]：Production and manufacturing method and process flow of heptanediol

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of manufacturing method
of heptanediol Heptanediol is an important chemical raw material, widely used in medicine, pesticides, spices, cosmetics and other fields. This article will introduce the manufacturing method of heptanediol.

1. the properties and uses of heptanediol

heptanediol is a colorless, transparent, slightly odorous liquid with a high boiling point and melting point, insoluble in water, soluble in organic solvents. Heptane glycol has a wide range of uses, can be used as a solvent, plasticizer, humectant, stabilizer, etc., can also be used in the production of pesticides, pharmaceutical intermediates and spices.

2. of the manufacturing method of heptanediol

1. Chloroheptane
Chloroheptane method is one of the main methods of manufacturing heptanediol. The method uses chloroheptane as raw material to prepare heptanediol through hydrolysis, reduction and other steps. The specific steps are as follows:
Hydrolysis of (1) Chloroheptane: Chloroheptane is mixed with an aqueous solution of sodium hydroxide, heated and refluxed to react to generate sodium heptanolate and sodium chloride.
(2) Acidification of sodium heptanol: Sodium heptanol is acidified with hydrochloric acid to produce heptanol and sodium chloride.
(3) Reduction of heptanol: Heptanol was reduced with hydrogen to produce heptanediol.

2. heptanoic acid method
heptanoic acid method is a method of manufacturing heptanediol with heptanoic acid as raw material. The method reacts heptanoic acid with formaldehyde and hydrogen in the presence of a catalyst to produce heptanediol. The specific steps are as follows:
(1) Reaction of heptanoic acid with formaldehyde: heptanoic acid is mixed with formaldehyde, and heated for reaction to generate heptanal.
(2) Hydrogenation reduction of heptanal: heptanal is reacted with hydrogen in the presence of a catalyst to produce heptanediol.
Precautions in the manufacturing process of
3.

1. Control the reaction temperature and time: In the manufacturing process, it is necessary to control the reaction temperature and time to ensure the smooth progress of the reaction and the purity of the product.
2. Select the appropriate catalyst: the choice of catalyst has an important influence on the rate and selectivity of the reaction, and it is necessary to select the appropriate catalyst according to the specific reaction conditions and requirements.
3. Prevent the occurrence of side reactions: In the manufacturing process, attention should be paid to prevent the occurrence of side reactions to ensure the purity and yield of the product.

4. Conclusion

is an important raw material for chemical production and has a wide range of uses. The chloroheptane method and the heptanoic acid method are the main methods for manufacturing heptanediol, and it is necessary to select a suitable manufacturing method according to specific conditions and requirements. In the manufacturing process, it is necessary to pay attention to controlling the reaction temperature and time, selecting the appropriate catalyst and preventing the occurrence of side reactions to ensure the purity and yield of the product.

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